The fifth order (_Myrtifloræ_) have regular four-parted flowers with usually eight stamens, but sometimes, through branching of the stamens, these appear very numerous. The myrtle family, the members of which are all tropical or sub-tropical, gives name to the order. The true myrtle (_Myrtus_) is sometimes cultivated for its pretty glossy green leaves and white flowers, as is also the pomegranate whose brilliant, scarlet flowers are extremely ornamental. Cloves are the dried flower-buds of an East-Indian myrtaceous tree (_Caryophyllus_). In Australia the order includes the giant gum-trees (_Eucalyptus_), the largest of all known trees, exceeding in size even the giant trees of California. Among the commoner _Myrtifloræ_, the majority belong to the two families _Onagraceæ_ and _Lythraceæ_. The former includes the evening primroses (_Œnothera_), willow-herb (_Epilobium_) (Fig. 113, _D_), and fuchsia; the latter, the purple loosestrife (_Lythrum_) and swamp loosestrife (_Nesæa_). The water-milfoil (_Myriophyllum_) (Fig. 113, _J_) is an example of the family _Haloragidaceæ_, and the _Rhexias_ of the eastern United States represent with us the family _Melastomaceæ_. The sixth order of the _Calycifloræ_ is a small one (_Thymelinæ_), represented in the United States by very few species. The flowers are four-parted, the calyx resembling a corolla, which is usually absent. The commonest member of the order is the moosewood (_Dirca_) (Fig. 113, _A_), belonging to the first of the three families (_Thymelæaceæ_). Of the second family (_Elæagnaceæ_), the commonest example is _Shepherdia_, a low shrub having the leaves covered with curious, scurfy hairs that give them a silvery appearance. The third family (_Proteaceæ_) has no familiar representatives. The seventh order (_Rosifloræ_) includes many well-known plants, all of which may be united in one family (_Rosaceæ_), with several sub-families. The flowers are usually five-parted with from five to thirty stamens, and usually numerous, distinct carpels. In the apple and pear (Fig. 114, _I_), however, the carpels are more or less grown together; and in the cherry, peach, etc., there is but a single carpel giving rise to a single-seeded stone-fruit (drupe) (Fig. 114, _E_, _H_). In the strawberry (Fig. 114, _A_), rose (_G_), cinquefoil (_Potentilla_), etc., there are numerous distinct, one-seeded carpels, and in _Spiræa_ (Fig. 114, _F_) there are five several-seeded carpels, forming as many dry pods when ripe. The so-called "berry" of the strawberry is really the much enlarged flower axis, or "receptacle," in which the little one-seeded fruits are embedded, the latter being what are ordinarily called the seeds.